| Electrical Network Configurations |
IT - System (ungeerdet, IT=isolé terre), TN - System (geerdet, TN=terre neutre), TT - System (geerdet, TT=terre terre) |
| IT - System |
Definition |
Ungrounded electrical low voltage systems for 2AC + 3AC or DC networks; description > VDE DIN 0100-410 |
| Features |
all conductive parts are grounded that do not belong to the operating circuit.
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IT-system provides the most advantages over the other network types in conjunction with insulation monitoring regarding the security of supply
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| Application |
Application in production plants and operating equipment , which can occur with abrupt interruptions significant economic damage and a further production must be avoided.
- Chemical industry
- Hard coal, brown coal and salt mining
- Glass industry
- Iron and steel industry
- Concrete industry
- Locomotives in rail transport
- Power supplies on ships
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Application in medically used rooms in services to patients where unplanned power interruptions can mean danger for life for patients.
- Hospitals, f.e. operating rooms, intensive care units
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| Insulation Moniroting |
Application |
- Monitoring during operating only in IT-systems
- Maximum protection for porple and equipment and against fire
- Equipment availability is increased
- Reduction of the risk of default to a minimum
- Further operating is possible in the first insukation fault; these single-pole errors happen with a probability of 90 %; initiated. operating processes can be completed.
- Continous monitoring has the advantage that troubleshooting can be initiated before the alrm message.
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| ISO-Wächter |
Function |
- The ISO monitor monitors the insulation resistance in the IT network during operating continously and activates a signal if the
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| Application |
- Application of only one ISO monitor is permiited in a lectrically connected network.
- Monitoring of disconnected areas is possible in grounded IT networks.
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